Sending many checkboxes via POST form to php page

I would like to send inputs and checkboxes values via POST method to php page for updating myql database table, the problem is that I cannot receive uncheked chechboxes, please look at the code below :

index.html :

<form id='form1' method='post' action='update.php'>
    <input type='hidden' name='id[]' value='1'>
    <input type='text' name='firstName[]' value='John'>
    <input type='checkbox' name="married[]" value='1' checked>
    <br/>
    <input type='hidden' name='id[]' value='2'>
    <input type='text' name='firstName' value='Linda'>
    <input type='checkbox' name="draft" value='1'>
    <br/>
    <input type='hidden' name='id[]' value='3'>
    <input type='text' name='firstName' value='Mercedes'>
    <input type='checkbox' name="draft" value='1' checked>
    <br/>
    <input type='button' name='submit' value='update'>
</form>

update.php

<?php
    print_r($_POST);
?>

The content of the $_POST is :

Array
(
[id] => Array
    (
        [0] => 1
        [1] => 2
        [2] => 3
    )

[firstName] => Array
    (
        [0] => 'John'
        [1] => 'Linda'
        [2] => 'Mercedes'
    )

[married] => Array
    (
        [0] => 1
        [1] => 1
    )

Like you see the 'married' fields is only received when checkboxes are checked, mean that Linda will be ignored, and mercedes will get the value 1 (married) of Mercedes.

How Can I resolve this?